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A catalytic amount of CuCl and Cs 2 CO 3 was employed to synthesize a variety of 2-substituted benzo[ b ]furans and indoles by an intramolecular cyclization of 2-alkynyl phenols and tosylanilines. This protocol features mild conditions, high yields and broad substrate scope, which makes it a practical method for the synthesis of 2-substituted benzo[ b ]furans and indoles.

rsc advances

Facile synthesis of 2-substituted benzo[<i>b</i>]furans and indoles by copper-catalyzed intramolecular cyclization of 2-alkynyl phenols and tosylanilines

Facile synthesis of 2-substituted benzo[b]furans and indoles by copper-catalyzed intramolecular cyclization of 2-alkynyl phenols and tosylanilines